As commented on by Deadspin,
I don’t have any information or context to provide to help you make sense of how this video came to be. The best I can do is this message board thread that has live play-by-play of the action, but it isn’t necessarily all that helpful. (“No one in the crowd. Including us, know what the fucks going on. Before you start shouting ‘staged’. I can confirm they arnt. The fights are SO bad that they couldn’t possibly been choreographed.”) Anyway, I think that’s for the best. You should be able to enjoy Spider-Man beating the absolute shit out of Batman and Robin without having to think about what you’re watching.
At least the Spiderman retains his cocky nature. The Batman and Robin were just so… underwhelming. Especially Batman. He seems underfed. Somebody give that man a burger.
I’d rather take Batusi Batman at this point.